WiFi networking is designed like the Internet - lossy. That is, it's expected to fail, and designed with recovery mechanisms built in. Your WiFi signal is lossy.

The signal emitted by your WiFi router is very light, intended to allow coverage distances based upon feet - not miles, as a broadcast radio or TV station. WiFi, as with radio and TV, radiates in a spherical pattern. Very few business or residential properties are spherical shaped. Locating a WiFi access point on your property, to provide coverage to all of your property, is not a simple task.

If you carry your WiFi equipped laptop around your house enough, eventually you will find a dead spot - somewhere with no signal, or not enough signal to provide enough bandwidth. You can do several things to work around this problem.

Say you like the third solution better, and now you have 2 WAPs. If you put both WAPs on different channels (so they don't cause interference to each other), and assign them the same SSID, you'll be free to move around, and the laptop wil automatically connect to which ever WAP is stronger, at any location. That's called roaming - it's a lossy solution, and it works well (within the limits of channel saturation).

However, there's a catch here. Whether you have a WiFi LAN with 1 WAP, 2 WAPs, or a dozen, if you don't setup your WiFi LAN properly, your laptop could just as easily connect to your neighbor's WiFi LAN. That could have various consequences.

You could end up with a connection thru a different ISP, with no access to services from your ISP.

You could end up on a different LAN, with no access to your other computers.

You could be arrested for leeching WiFi (stated to be illegal in some jurisdictions).

If you setup your WiFi LAN properly, this won't be a problem. Whether you have only one WAP, or a dozen.

First, setup the APs. If you have more than one AP, use the same SSID, and security settings, to allow roaming by the clients.

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As long as anybody can walk into Sears or
Walmart, and buy a computer or piece of networking gear, take it home,
and install it by herself (himself) there will always be possible
problems. I'll try to help identify the problems, and figure out the
solutions.